Geologic Hazards

Novarupta

Most Powerful Eruption of the 20th Century: One hour later, the blast was heard in Juneau.

Tsunami Causes

What Causes a Tsunami? Learn how plate motions trigger earthquakes and tsunamis.

Rock Fall Photos

Yosemite Rock Fall Photos: A photo sequence of a rockfall and debris avalanche by Herb Dunn.

If it is not grown, it is mined.

Abandoned Mines

Abandoned Mine: accidents take 20 to 30 lives per year. Many can be prevented with education.

Expansive Soils

Expansive Soil: Causes more damage than earthquakes, floods, hurricanes & tornadoes combined.

Landslides

Landslides: A USGS fact sheet about landslides and events that trigger them.

Oil is found first in the mind.

Volcanic Explosivity

Volcanic Explosivity: Rating volcanic eruptions based upon the volume of tephra ejected.

Volcanos

Volcanoes: Articles about volcanoes, volcanic hazards and eruptions past and present.

San Andreas Map

Google Map of the San Andreas Fault: Zoom in to see the fault trace plotted atop of a map or satellite images.

The present is the key to the past.

Impact Craters

Asteroid Impact Craters! Zoom in on 50 of Earth's largest impact craters.

Hurricane Insurance

Homeowner's Insurance and Geologic Hazards: Most policies do not cover geologic hazards such as landslide damage.

New Madrid Mystery

New Madrid Earthquakes: Why do large earthquakes occur far from an active plate boundary?

Geology underlies it all.